Huffington Post has a couple of new episode stills from from the upcoming Halloween Special episode.
There is a little bit of confusion on the site as it lists it under an upcoming episode that Lucy will not be in but hopefully they will clear that up pretty quickly.

SEASON 5 EPISODE 5: Halloween Surprise

Ben gets a job offer, forcing Leslie to think about their future; Ron and Andy take Diane's girls trick-or-treating; Tom looks for a new business idea




Clip: All Princesses, All the Time
Diane is less than thrilled with her daughters' costume choices. Ron and Andy take Diane's girls trick-or-treating




For more about Lucy's role as Diane on Parks and Recreation Season 5 visit the AUSXIP Lucy Lawless Parks and Recreation subsite